A dog's happiness is honest happiness.
And Bonnie's happiness, visible here, is no different.

Shot on a EOS 750D with a SIGMA ZOOM 55-200mm F4-5.6 DC while crawling on the ground, the biggest challenge was to balance the fairly harsh sunlight and her fur's strong shimmer.

Settings:
1/400th sec
200mm, F8
ISO-320 (Auto)
"Center-weighted average" metering